License Image The flexor retinaculum (transverse carpal ligament), is a strong, fibrous band that arches over the wrist, converting the deep groove on the front of the carpal bones into a tunnel, the carpal tunnel, through which the flexor tendons of the hand and the median nerve pass. Nine extrinsic flexor tendons pass through the carpal tunnel. They are: the flexor pollicis longus, […]